Improvement in permutation-locks



Patented Jan. 13. 187 4.

Iock.

C. C. BLISS.

Permutationa UNITED STATEs GHARLES C. BLISS, OF NORWICH, CONNEGTICUT.

IMPROVEMENT IN PERMUTATlON--LOKS.`

Specifieaiun form'ng art ol' Letters Patent No. 146 4124, dated January 13, 1674; application filed I December 4, 1873.

To all whom tt may concem:

Be it known that I, CHARLES C. BLISS, of Norwich, in the State of Connecticut, have invented an Improvement in Pernnitation-Locks, of which the following is a speciiication This invention relates to that class of looks in which a range of circular tunblers is einployed, and the tumblers are turned by a eentral spindle.

I make use of a lever between the cam on' the spindle and the dog for the bolt, and combine therewith a safety-stop and lever, that are brought into action by the fence when the tumblers are not properly set to allow the fence to pass into thenotches; thereby the safetystop is positoned so as to arrest the movement of the lever and prevent the boltdog being lifted.

In the drawing, Figure l is a section longtudinally of the spindle. Fi g. 2 is an elevation of the lock with the back plate removed and the bolt retracted. Fig. 3 is a similar View with the bolt projected and the parts in the position they assume when an improper effort is made to retract the bolt. Fig. 4 represents the key for the tumbler rings, and Fig. 5 shows the swng'ng contaet'block upon the tumblers. y

The spindle a is provided with a knob, I), and dial c, of usual construction. d is the twopart cam at the inner end of the spindle to act upon the talon 3 of the bolt to withdraw or project the same, and also to operate the arm e of the lever f, of which 4 is the fulcrum. The hinged dog g holds the bolt k in a projected or retracted position, and this dog is operated by the end' 5 i of the lever f. The spindle a is mounted so as to be movable endwise, as has heretofore been usu al, so that when drawn forward the cam d will operate upon the arm e of lever f and talon 3 to move the bolt and lever, if the tumblers are in the correct position to allow the fence i to enter the notches o. The spindle a has to be pushed back in order that thepin 7 may act upon the tumblers to revolve them and set them successivel y, and when acting upon the tumblers the cam d is entirely out of contact with the bolt, and when the spindle is drawn forward to act upon the bolt, the connection with the tumblers is severed.

orlarge hole and a spring, as in Fig. 6. Iu

ether case a light spring is employed to retain the parts in a normal position.

It. is preferable to connect the lever l to the lever f by the fulcrun 8; but this secondary lever or bar may be constructed in any convenient manner for communioating the movement next set forth to the safety-stop m. i

If the fence 'i passes into the notches o freely, the safety-stop m swingsclear of the arrestingblock n, as illustrated by dotted lines. If the fenee z' touches one of the tumblers, then the safety-stop is swung and comes into contact with the block n, and prevents the bolt-dog g being raised, and the part-s of m and n that come together being beveled, the eft'ort made to move the lever e f results in turning the stop m and moving the felice?) back awayfrorn the tuinblers, as seen in Fig. 3, so that it is impossible to feel the notch by the contact of the fence' therewith, even if the bolt or the levers f e l are clamped in any manner while the tumblers are being turned. i

The tunblers are made of rings s, surrounding grooved disks t upon the stationary stud u, and the notches 0 are in the rings s. The

rings s and disk t are kept in the proper relative positions by small cans 12, that are perforated for the reception of a square shaft, o, that can be passed through all these cams and turned to release the hold of the rings s` upon the disks t at the time the notches 0 are in line with the fen ce t'. The spindle and disks t can be turned so as to set the latter at any desired figures or letters upon the dial c, and then the About a quarter=tur`n of 4 the shutt is made to loosen the disks and -ings, and the pin 15 prevents the shaft e being Withdrawn until the parts are again tighteed by turning the shztft and owns back to bring the pin opposite the notch in the escutcheon, where it can be withdrawn.

In looks with circular tumblers, there is .usually a pin or stop upon each tunbler or its hlocks are made to turn easily upon the screws 18, and the amount of motion is limited by the stops 19, so that When the stop stands` in the position shown in Fig. 5 by either the full or dotted line, the pin 20 upon the next tumbler oocupies the one position indieated.

I claim as my invention The secondary lever or bar l, fence 17, and safety-stop m, in combination With the leverj", bolt k, dog g, and tumblers s, substantially as set forth.

Signed by me this 2d day of December, A. D. 187 3.

CHARLES G. BLISS.

XVitnesses GEO. T. PINCKNEY, OHAS. H. SMITH. 

